Separator for an alkaline cell and a method of producing the separator

Abstract

A new separator for an alkaline cell is provided, which can prevent deformation to an end of the separator and also prevent short circuits within the cell structure when an external force is added to the cell. The separator has a characteristic that a ratio of a tensile strength of a longitudinal direction of a separator base paper and a tensile strength of a widthwise direction of the base paper is within a range of 2/1 to 1/1. The invention provides a new method of producing the separator. The method permits reliability in sealing properties of a closed bottom end and high productivity. The method has the steps of: winding the base paper to form a cylindrical body; subjecting the cylindrical body to a closed bottom forming step while the cylindrical body is held by a clamping device to maintain its cylindrical shape; heat-bonding an end of the cylindrical body to close the end; and releasing the cylindrical body from the cylindrical clamping device.

Dependencies are inferred from the claim text.